How did he know she was a lesbian?
Well, he just did. He was carrying an assault marker for goodness sakes, what's wrong with you people? /s
Perhaps the attacker was a queer looking to attack a boy in the alley, got what looked like a boy in the alley, then found it was not a boy and he went bonkers.
THAT’S my story and I’m sticking to it! ;-D
It was written on the back of her collar with a laundry pen.